<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <el-card>
            <!-- 警告区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
            </el-alert>

            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs :tab-position="'left'" v-model="activeIndex" 
                    :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <!-- 选择商品分类的级联选择框 -->
                            <el-cascader  
                                :options="catelist" 
                                :props="cateProps" 
                                v-model="addForm.goods_cat" 
                                @change="handleChange" clearable>
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id" prop="goods_name">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id" prop="goods_name">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- 表示图片要上传到的后台地址 -->
                        <el-upload :action="uploadURL" 
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture" :headers="headerObj" 
                            :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                            <!-- <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div> -->
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce">
                        </quill-editor>

                        <!-- 添加商品按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'
export default {
    data(){
        return {
            // 控制tab标签页的索引
            activeIndex: '0',
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat: [],
                // 图片的数组
                pics: [],
                // 商品的详情描述
                goods_introduce: '',
                // 动态参数和静态属性
                attrs: []
            },
            // 表单校验对象
            addFormRules: {
                goods_name: [
                    { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price: [
                    { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight: [
                    { required: true, message: '请输入商品重量', trigger: 'blur' }
                ],
                goods_number: [
                    { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat: [
                    { required: true, message: '请选择商品分类', trigger: 'blur' }
                ]
            },
            // 商品分类列表
            catelist: [],
            // 级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                expandTrigger: "hover"
            },
            // 动态参数列表数据
            manyTableData: [],
            // 静态属性列表数据
            onlyTableData: [],
            // 上传图片的url
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的headers请求头对象
            headerObj: {
                Authorization: window.sessionStorage.getItem('token')
            },
            // 点击图片展示图片的url
            previewPath: '',
            // 控制图片预览对话框的展示与隐藏
            previewVisible: false
        }
    },
    created(){
        this.getCateList()
    },
    methods: {
        async getCateList(){
            const {data: res} = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类失败')
            }
            this.catelist = res.data
        },
        // 级联选择框选中项变化会触发这个函数
        handleChange(){
            console.log(this.addForm.goods_cat)
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            // console.log('即将离开的标签页名字是'+oldActiveName)
            // console.log('即将进入的标签页名字是'+activeName)
            if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                this.$message.error('请先选择商品分类')
                return false
            }
        },
        // 点击tab标签页时触发的事件
        async tabClicked(){
            // console.log(this.activeIndex)
            // 证明访问的额是动态参数面板
            if(this.activeIndex === '1'){
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{
                        sel: 'many'
                    }
                })
                if(res.meta.status !== 200){
                    return this.$message.error('获取参数列表失败')
                }
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0? [] : item.attr_vals.split(',')
                })
                this.manyTableData = res.data
            }else if(this.activeIndex === '2'){
                const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{
                        sel: 'only'
                    }
                })
                if(res.meta.status !== 200){
                    return this.$message.error('获取属性列表失败')
                }
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file){
            console.log(file)
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file){
            console.log(file)
            // 1、获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            // 2、从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            // 3、调用数组的splice方法，把图片信息对象，从pice数组中移除
            this.addForm.pics.splice(i,1)
        },
        // 监听图片上传成功的事件
        handleSuccess(response){
            // console.log(response)
            // 1. 拼接得到一个图片信息对象
            const picInfo = { pic: response.data.tmp_path }
            // 2. 将图片信息对象，push 到pics数组中
            console.log(picInfo)
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        // 添加商品
        add(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid){
                    return this.$message.error('请填写必要的表单项')
                }
                // 执行添加的业务逻辑
                // 复制一份
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                //处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals.join(',')
                    }
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id: item.attr_id,
                        attr_value: item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form)

                // 发起请求添加商品
                // 商品的名称必须是唯一的
                const {data: res} = await this.$http.post('goods',form)
                if(res.meta.status !== 201){
                    return this.$message.error('商品添加失败')
                }
                this.$message.success('商品添加成功')
                this.$router.push('/goods')
            })
        }
    },
    computed: {
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
// .el-tabs {
//     margin-left: 220px;
// }
.el-checkbox {
    margin: 0 10px 0 0 !important;
}
.previewImg {
    width: 100%;
}
.btnAdd {
    margin-top: 15px;
}
</style>
